Improving QGIS source code efficiency?
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4
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I have noticed in the QGIS source code that the map layers gets added in two
different places, in the Canvas and in the registry as follow:
QgsMapLayerRegistry::instance()->addMapLayers(theMapLayers, TRUE);
//! Create the Map Canvas
m_pMapCanvas = new QgsMapCanvas(0, 0);
// Set the Map Canvas Layer Set
m_pMapCanvas->setLayerSet(myRList);
It seems like two separate copies of the map layers is being added to two different places, is there is away to make this more efficient?
qgis c++
edited Nov 11 at 16:37
Vince
14.3k32646
asked Nov 11 at 5:39
user9995
473
add a comment |
up vote
4
down vote
favorite
I have noticed in the QGIS source code that the map layers gets added in two
different places, in the Canvas and in the registry as follow:
QgsMapLayerRegistry::instance()->addMapLayers(theMapLayers, TRUE);
//! Create the Map Canvas
m_pMapCanvas = new QgsMapCanvas(0, 0);
// Set the Map Canvas Layer Set
m_pMapCanvas->setLayerSet(myRList);
It seems like two separate copies of the map layers is being added to two different places, is there is away to make this more efficient?
qgis c++
edited Nov 11 at 16:37
Vince
14.3k32646
asked Nov 11 at 5:39
user9995
473
add a comment |
up vote
4
down vote
favorite
up vote
4
down vote
favorite
I have noticed in the QGIS source code that the map layers gets added in two
different places, in the Canvas and in the registry as follow:
QgsMapLayerRegistry::instance()->addMapLayers(theMapLayers, TRUE);
//! Create the Map Canvas
m_pMapCanvas = new QgsMapCanvas(0, 0);
// Set the Map Canvas Layer Set
m_pMapCanvas->setLayerSet(myRList);
It seems like two separate copies of the map layers is being added to two different places, is there is away to make this more efficient?
qgis c++
edited Nov 11 at 16:37
Vince
14.3k32646
asked Nov 11 at 5:39
user9995
473
I have noticed in the QGIS source code that the map layers gets added in two
different places, in the Canvas and in the registry as follow:
QgsMapLayerRegistry::instance()->addMapLayers(theMapLayers, TRUE);
//! Create the Map Canvas
m_pMapCanvas = new QgsMapCanvas(0, 0);
// Set the Map Canvas Layer Set
m_pMapCanvas->setLayerSet(myRList);
It seems like two separate copies of the map layers is being added to two different places, is there is away to make this more efficient?
qgis c++
qgis c++
edited Nov 11 at 16:37
Vince
14.3k32646
asked Nov 11 at 5:39
user9995
473
edited Nov 11 at 16:37
Vince
14.3k32646
asked Nov 11 at 5:39
user9995
473
edited Nov 11 at 16:37
Vince
14.3k32646
edited Nov 11 at 16:37
Vince
14.3k32646
edited Nov 11 at 16:37
Vince
14.3k32646
14.3k32646
asked Nov 11 at 5:39
user9995
473
asked Nov 11 at 5:39
user9995
473
asked Nov 11 at 5:39
user9995
473
473
add a comment |
add a comment |
1 Answer
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up vote
6
down vote
There's no inefficiency here. They are only c++ pointers to the same layer instance -- it's not two instances in separate memory of the same map layer.
answered Nov 11 at 8:56
ndawson
17.6k22640
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
6
down vote
There's no inefficiency here. They are only c++ pointers to the same layer instance -- it's not two instances in separate memory of the same map layer.
answered Nov 11 at 8:56
ndawson
17.6k22640
add a comment |
up vote
6
down vote
There's no inefficiency here. They are only c++ pointers to the same layer instance -- it's not two instances in separate memory of the same map layer.
answered Nov 11 at 8:56
ndawson
17.6k22640
add a comment |
up vote
6
down vote
up vote
6
down vote
There's no inefficiency here. They are only c++ pointers to the same layer instance -- it's not two instances in separate memory of the same map layer.
answered Nov 11 at 8:56
ndawson
17.6k22640
There's no inefficiency here. They are only c++ pointers to the same layer instance -- it's not two instances in separate memory of the same map layer.
answered Nov 11 at 8:56
ndawson
17.6k22640
answered Nov 11 at 8:56
ndawson
17.6k22640
answered Nov 11 at 8:56
ndawson
17.6k22640
answered Nov 11 at 8:56
ndawson
17.6k22640
17.6k22640
add a comment |
add a comment |
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